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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdd162d99d6d11b9adb1f01005137f8ab9ab51ad38e72df3845fdbd75df5451' 
  AND token = 'v23ZsDfaYC29xlRCTuoDT1FdEQvIktCV/nqZrr2PUs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}